Remove broken 'STAPLEImageFilter'

This commit removes the filter because of the following error:

569: Traceback (most recent call last):
569:   File "/home/jcfr/Projects/Slicer-Debug/Slicer-build/lib/Slicer-4.4/qt-scripted-modules/SimpleFilters.py", line 249, in onFilterSelect
569:     self.filterParameters.create(json)
569:   File "/home/jcfr/Projects/Slicer-Debug/Slicer-build/lib/Slicer-4.4/qt-scripted-modules/SimpleFilters.py", line 795, in create
569:     w = self.createIntWidget(member["name"],t)
569:   File "/home/jcfr/Projects/Slicer-Debug/Slicer-build/lib/Slicer-4.4/qt-scripted-modules/SimpleFilters.py", line 931, in createIntWidget
569:     w.setValue(int(default))
569: ValueError: Called setValue(int val) with wrong arguments: (4294967295,)
569: Testing filter "STAPLEImageFilter" (202 of 259).